The backup volume is full. If you're using it for anything but Time Machine, move the other data to another drive. Otherwise, you need a bigger drive. There isn't enough space on that one for even a single snapshot of both computers.

4. Under the "Action" item (or gear icon), select the delete option you

want.

That did the trick for me. I did notice before I did this some "ghost" bars in the backup screen for old dates that cannot be accessed. More are seen there now. I guess these are just place holders, I don't know.

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